move netutil (#5552)

netutil/src/ip_echo_server.rs

@@ -1,44 +0,0 @@
-use log::*;
-use std::net::SocketAddr;
-use tokio;
-use tokio::net::TcpListener;
-use tokio::prelude::{Future, Stream};
-use tokio::runtime::Runtime;
-
-pub type IpEchoServer = Runtime;
-
-/// Starts a simple TCP server on the given port that echos the IP address of any peer that
-/// connects.  Used by |get_public_ip_addr|
-pub fn ip_echo_server(port: u16) -> IpEchoServer {
-    let bind_addr = SocketAddr::from(([0, 0, 0, 0], port));
-    let tcp =
-        TcpListener::bind(&bind_addr).unwrap_or_else(|_| panic!("Unable to bind to {}", bind_addr));
-    info!("bound to {:?}", bind_addr);
-
-    let server = tcp
-        .incoming()
-        .map_err(|err| warn!("accept failed: {:?}", err))
-        .for_each(move |socket| {
-            let ip = socket
-                .peer_addr()
-                .and_then(|peer_addr| {
-                    bincode::serialize(&peer_addr.ip()).map_err(|err| {
-                        std::io::Error::new(
-                            std::io::ErrorKind::Other,
-                            format!("Failed to serialize: {:?}", err),
-                        )
-                    })
-                })
-                .unwrap_or_else(|_| vec![]);
-
-            let write_future = tokio::io::write_all(socket, ip)
-                .map_err(|err| warn!("write error: {:?}", err))
-                .map(|_| ());
-
-            tokio::spawn(write_future)
-        });
-
-    let mut rt = Runtime::new().expect("Failed to create Runtime");
-    rt.spawn(server);
-    rt
-}